Improvement in indicator for saw-mill head-blocks



Patented Dec. 21,1869} 'LPEI'ERS, PNOYCLUTHOGRAPHER. WASHINGTON. u. c.

awn swat strut dififlinr.

Letters Patent 1V 98,111, dated December 21, 1869,

IMPROVEMENT IN INDICATOR FOR SAW-MILL HEAD-BLOCKS.

The Schedule referred to in these Letters Patent and making part of thesame To all whom it may concern:

Be it known that I, GEORGE Saunas, of Erie, in the county of Erie, andState of Pennsylvania, have invented a new and improvedlndicator forSaw-Mill Head-Blocks.

The nature of my invention consists in providing an indicator, to beattached to the gearing of saw-mill head-blocks, by which the operatorcan, at any time, tell, without measuring or arithmetical calculation,how much timber he has left in the log being sawed,

and how much stuff of a certain thickness he can prodnce from theremaining portion of the log.

My invention consists of a dial, revolving, by the action of thehead-block gearing, in a circular rim, and under a fixed index, or ricecars.

In the accompanying drawings- Figure 1 shows a. top or face view of myindicator.

Figure 2 is a sectional view of the same.

The description of my invention is as follows:

A isa brass dial.

B is a rim, in which the dial fits.

N is a plate, on which the dial is secured.

G is an index-bar, which passes along the diameter of the rim B, and issecured to it by the screws P P.

D is a frame, which is collared on to the shaft- Y, which is the mainshaft of the gearing of the headblocks.

The dial, rim, &c., are secured to the flame D by the screw K.

- The rim B, by being secured to the index-bar C, is

held stationary by the screwK; but the dial is movable around the pivotF, and within the rim B.

The plate N, on its under side, is a bevel-gear, and

' gears with the pinion E, at R S, fig. 2.

The pinion E is secured to the shaft Y by the setscrews H H, fig. 1.

Now, when the shaft Y revolves, the plate N and the dial A, beingsecured to it, ar'emade to revolve around the pivot F, and in the rim B;and, as the number of cogs on the plate N is the product of the numberofcogs on the pinion E multiplied by the number of revolutions the shaftY is required to make to carry the knees of the head-blocks one tour, itwill be seen that the dial will make just one revolution to every tourof the knees. Hence, if the circumference of the dial A is divided intoas many spaces as the knees, when drawn back, are inches from the saw,and those spaces numbered, and the index is set at 0, when the knees aredrawn back, the dial must, at any time, show, at the index-bar on theouter circle, how far the knees are from the saw.

The dial, it will be seen, is laid out in concentric circles, and theouter circle, as before stated, is divided into as many spaces as theknees move inches.

The other circles are gmduated for different thicknesses of boards andplank up to two inch plank, and

an allowance made for saw-kert'; and-the thickness of board or plankcalculated on the index-bar G.

The rim B is also graduated the same as the outer circle of the dial,and the point 0 is placed one sawkert' from the index-bar C.

Now, if it is desired to saw stuff exceeding two inches in thickness,as, for example, four inches in thickness, the operator will find figure4 on the rim 1), and will see what figure on the outer circle of thedial coincides. (In the drawings, it is 37.) He then moves the kneesuntil the dial shows the figures 37 at the index-bar. That indicatesthat the knees, and, of course, the log, have moved four inches and onesawkert' toward the saw-line, for 4 on the rim B is four each circlemarked on spaces and one saw-kerf spacefrom the index-bar (l.

and each space represents an inch.

' What I claim as my invention, is as follows:

1. The dial A, graduated, so as to indicate the sow era-l thicknesses oflumber which may be sawed from a. log, with an allowance made forsaw-kerf', as doscrihed, when used in connection with saw-millheadblocks.

2. The rim B and index-bar O, in combination with the dial A, whenconstructed and operated in connection with a saw-mill head-block, forthe purposes set forth.

3. The shaft Y, 'pinion E, and frame D, in combination with the plate N,dial A, rim B, and index-bar 0, all constructed and operated as and forthe purposes set forth.

GEO. SELDEN.

\Vitnesses:

O. O. Bnrccs, Jso. K. HALLOCK.

